I installed the JW Player, as described in the documentation, putting it in the /public_html/wp-content/plugins/tubepress_pro_3_0_1/src/main/web/flash/longtail folder, but when I choose JW Player in Tubepress plugin admin, no player shows on the page, just a blank spot where it should be.
Btw, I think you ought to make it clear in the options page for setting up the player in admin that the JW Player needs to be manually installed. There's no indication of that, so I had to go searching for an answer.
Unfortunately, even though I found the answer in your documentation, it still doesn't work.